Automobile speed regulating module and manufacturing method thereof

Abstract

The present invention provides an automobile speed control module, comprising a plastic base and a radiator, wherein a circuit board assembly, a connection terminal, a heating device and a clip are arranged in a sealed space enclosed by the plastic base and the radiator, a connector interface is provided on the plastic base, one end of the connection terminal extends into the connector interface, and the other end of the connection terminal is welded to the circuit board assembly, the heating device is installed on the circuit board assembly through a clip, the clip is located between the heating device and the circuit board assembly, the two ends of the clip abut against the inner wall of the plastic base, the heating device is bonded to the radiator under the pressure of the clip, and the plastic base and the radiator are sealed and connected by an adhesive. An embodiment of the present invention also provides a method for manufacturing an automobile speed control module.

Description

Technical Field

[0001] The invention relates to the field of speed regulating modules for regulating the wind speed of a blower of an automobile air conditioner, and in particular to an automobile speed regulating module and a manufacturing method thereof. Background Art

[0002] The automobile air conditioning speed control module is an electronic component that adjusts the speed of the automobile blower. The signal transmitted from the automobile control panel changes the terminal voltage of the blower to achieve speed control. Generally, in order to prevent water vapor and water droplets condensed from the radiator from entering the module, the connection parts of the radiator generally need to be waterproof, generally using one-piece injection molding, sealant or sealing gaskets. The function of the radiator is to dissipate heat for the heating device (field effect transistor), so the heating device needs to have good contact with the radiator. Generally, screws are used to connect and thermal conductive materials are filled between the two to achieve contact and heat transfer. The connection between the radiator and the heating device, such as the key parts, is connected by screws. It may happen that the screws are not tightened or the bottom hole of the radiator screw is not deep enough. The screws cannot ensure the contact between the heating device and the radiator. Such situations are also difficult to detect during the manufacturing process, which ultimately leads to defects during product use.

[0003] Therefore, it is necessary to design a new automobile speed control module to overcome the above problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a vehicle speed control module, which at least solves some of the problems in the prior art.

[0005] The present invention is achieved in that:

[0006] The present invention provides an automobile speed regulation module, comprising a plastic base and a radiator, wherein a circuit board assembly, a connecting terminal, a heating device and a retaining spring are arranged in a sealed space enclosed by the plastic base and the radiator, a connector interface is provided on the plastic base, one end of the connecting terminal extends into the connector interface, and the other end of the connecting terminal is welded to the circuit board assembly, the heating device is installed on the circuit board assembly through the retaining spring, the retaining spring is located between the heating device and the circuit board assembly, the two ends of the retaining spring abut against the inner wall of the plastic base, the heating device is bonded to the radiator under the pressure of the retaining spring, and the plastic base and the radiator are sealed and connected by an adhesive.

[0007] Preferably, the retaining spring includes four first protruding walls located in the middle and two second protruding walls located at the ends. The retaining spring is positioned and connected to the circuit board assembly through the first protruding walls and the second protruding walls. An opening for clamping the first protruding wall is provided in the middle of the substrate of the circuit board assembly, and an opening groove for clamping the second protruding wall is provided at the edge of the substrate of the circuit board assembly. The second protruding wall extends from the heat sink toward the plastic base, and the second protruding wall abuts against the inner wall of the plastic base.

[0008] Preferably, a circuit board assembly receiving groove is provided in the plastic base, a plurality of buckles for clamping the heat sink are provided in the plastic base, and a groove for clamping with the buckles is provided on the top of the heat sink.

[0009] Preferably, an annular glue filling groove is provided on the inner wall of the plastic base, the glue filling groove faces the top edge of the radiator, the glue filling groove is filled with a sealing thermal conductive filler, and the plastic base is sealed and connected to the radiator via the sealing thermal conductive filler.

[0010] Preferably, a sealing thermal conductive filler is coated on the assembly surfaces of the heat sink and the heating element.

[0011] Preferably, an anti-error groove is provided at an edge of the substrate of the circuit board assembly, and an anti-error rib that is snap-fitted into the anti-error groove is provided in the plastic base.

[0012] Preferably, the connection terminal is provided with two positioning posts, and the substrate of the circuit board assembly is provided with positioning holes corresponding to the positioning posts.

[0013] The present invention also provides a method for manufacturing an automobile speed regulating module, comprising the following steps:

[0014] S1. A circle of glue filling grooves is provided at the assembly position of the plastic base and the radiator. A plurality of buckles are provided in the plastic base 1, and a groove matching with the buckles is provided on the radiator;

[0015] S2, soldering the connection terminals to the circuit board assembly;

[0016] S3, assembling the clip onto the heating device, assembling the circuit board assembly with the welding connection terminal according to the positioning structure of the clip, and then welding the heating device and the temperature fuse;

[0017] S4. Fill the glue slot with sealing thermal conductive filler before assembling with the radiator. Also, apply sealing thermal conductive filler to the part of the radiator where the heating device is assembled.

[0018] S5, placing the circuit board assembly equipped with the connection terminals and the heating device into the plastic base;

[0019] S6. When the plastic base and the heat sink are assembled, the spring mounted on the back of the heating element pushes against the plastic base and the elastic force of the deformation causes the heating element to be pressed tightly against the surface of the heat sink, thus completing the assembly of the heating element;

[0020] S7, the plastic base and the heat sink are assembled and fixed by snap connection;

[0021] S8. The sealed thermal conductive filler is naturally cured or baked to bond the plastic base and the heat sink into a whole.

[0022] The present invention has the following beneficial effects:

[0023] 1. The present invention provides an automobile speed regulating module with simple production steps and more reliable structure, stable assembly quality and high production efficiency.

[0024] 2. The present invention adopts a sealing thermal conductive filler to solve the sealing and connection problems between the radiator and the plastic base, simplifies the manufacturing steps of the automobile speed control module, eliminates the screw connection process, and adopts a method of pressing and bonding after the retaining spring to further improve product reliability.

[0025] 3. The automobile speed regulating module provided by the present invention avoids screw installation in the entire manufacturing process, has simple manufacturing steps and lower manufacturing cost.

[0026] 4. The automobile speed regulating module provided by the present invention avoids defects caused by loose screws or untightened screws, and the clamping structure using a retaining spring is more reliable.

[0027] 5. The automobile speed control module provided by the present invention uses a sealing thermal conductive filler to perfectly solve the sealing problem of the product and avoid defects such as fatigue and aging.

[0028] 6. The automobile speed regulating module provided by the present invention shortens the production process, reduces equipment and manpower investment, and can easily realize automated production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 An exploded view of a vehicle speed control module provided by an embodiment of the present invention;

[0031] Figure 2 A schematic diagram of a buckle and glue filling provided in an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of a circuit board assembly provided by an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the working state of the retaining spring provided in an embodiment of the present invention;

[0034] Figure 5 A schematic diagram of a connection terminal pin arrangement provided in an embodiment of the present invention;

[0035] Figure 6 A cross-sectional view of a connecting terminal pin row provided by an embodiment of the present invention;

[0036] Figure 7 A schematic diagram of a retaining spring provided in an embodiment of the present invention;

[0037] Figure 8 This is a flow chart for making a traditional automobile speed control module;

[0038] Fig. 9 This is a flowchart of the production of the automobile speed regulation module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] like Figure 1-Figure 9 An embodiment of the present invention provides an automobile speed control module, including a plastic base 1 and a radiator 2. A circuit board assembly 4, a connecting terminal 5, a heating device 3 and a retaining spring 6 are arranged in a sealed space enclosed by the plastic base 1 and the radiator 2. A connector interface 11 is provided on the plastic base 1. One end of the connecting terminal 5 extends into the connector interface 11. The other end of the connecting terminal 5 is welded to the circuit board assembly 4. The heating device 3 is installed on the circuit board assembly 4 through the retaining spring 6. The pins of the heating device 3 are welded to the circuit board assembly 4. The retaining spring 6 is located between the heating device 3 and the circuit board assembly 4. The two ends of the retaining spring 6 are in contact with the inner wall of the plastic base 1. The heating device 3 is bonded to the radiator 2 under the pressure of the retaining spring 6. The plastic base 1 and the radiator 2 are sealed and connected by an adhesive.

[0041] The invention provides an automobile speed regulating module with simple production steps and more reliable structure, stable assembly quality and high production efficiency.

[0042] The retaining spring 6 includes four first protruding walls 61 located in the middle and two second protruding walls 62 located at the ends. The retaining spring 6 is positioned and connected to the circuit board assembly 4 through the first protruding walls 61 and the second protruding walls 62. An opening is provided in the middle of the substrate of the circuit board assembly 4 to engage with the first protruding wall 61. An opening groove is provided on the edge of the substrate of the circuit board assembly 4 to engage with the second protruding wall 62. The second protruding wall 62 extends from the heat sink 2 toward the plastic base 1, and the second protruding wall 62 abuts against the inner wall of the plastic base 1.

[0043] The plastic base 1 is provided with a groove for accommodating the circuit board assembly 4 , and the plastic base 1 is provided with a plurality of buckles 12 for clamping the heat sink 2 . The top of the heat sink 2 is provided with a groove 22 for clamping with the buckles 12 .

[0044] An annular glue-filling groove 13 is provided on the inner wall of the plastic base 1, and the glue-filling groove 13 faces the top edge of the heat sink 2. The glue-filling groove 13 is filled with a sealing thermal conductive filler 21, and the plastic base 1 is sealed and connected to the heat sink 2 via the sealing thermal conductive filler 21. The sealing thermal conductive filler 21 is coated on the assembly surfaces of the heat sink 2 and the heating element 3.

[0045] The present invention adopts a sealing heat-conducting filler to solve the sealing and connection problems between the radiator and the plastic base, simplifies the manufacturing steps of the automobile speed control module, eliminates the screw connection process, and adopts a method of pressing and bonding after the clip spring to further improve product reliability.

[0046] An anti-error groove 41 is provided at the edge of the substrate of the circuit board assembly 4 , and an anti-error rib for engaging with the anti-error groove 41 is provided in the plastic base 1 .

[0047] The connection terminal 5 is provided with two positioning posts 51, and the substrate of the circuit board assembly 4 is provided with positioning holes corresponding to the positioning posts 51. The connection terminal 5 is formed by injection molding of a plurality of inserts 52, and a hollow circular hole 53 is provided on the inserts to prevent the inserts from falling out after injection molding.

[0048] The automobile speed regulating module provided by the present invention avoids screw installation in the entire manufacturing process, has simple manufacturing steps and lower manufacturing cost.

[0049] The automobile speed regulating module provided by the present invention avoids defects caused by loose screws or untightened screws, and adopts a clamping spring compression structure that is more reliable.

[0050] The automobile speed regulating module provided by the present invention uses a sealing heat-conductive filler to perfectly solve the sealing problem of the product and avoid defects such as fatigue and aging.

[0051] The automobile speed regulating module provided by the present invention shortens the production process, reduces equipment and manpower input, and can easily realize automated production.

[0052] The embodiment of the present invention also provides a method for manufacturing an automobile speed regulating module, comprising the following steps:

[0053] S1. A circle of glue filling grooves 13 are provided at the assembly position of the plastic base 1 and the radiator 2. A plurality of buckles 12 are provided in the plastic base 1. The radiator 2 is provided with grooves 22 that cooperate with the buckles 12.

[0054] S2, welding the connecting terminal 5 to the circuit board assembly 4;

[0055] S3, assembling the clip 6 onto the heating element 3, assembling the circuit board assembly 4 with the welding connection terminal 5 according to the positioning structure of the clip 6, and then welding the heating element 3 and the temperature fuse 7;

[0056] S4, before assembling with the heat sink 2, fill the sealing thermal conductive filler 21 in the glue filling groove 13, and also apply the sealing thermal conductive filler 21 to the part of the heat sink 2 where the heating element 3 is assembled;

[0057] S5, installing the circuit board assembly 4 equipped with the connection terminal 5 and the heating element 3 into the plastic base 1;

[0058] S6, when the plastic base 1 is assembled with the heat sink 2, the spring 6 assembled on the back of the heating element 3 presses against the plastic base 1 to produce a deformed rebound force to press the heating element 3 tightly against the surface of the heat sink 2, thus completing the assembly of the heating element 3;

[0059] S7, the plastic base 1 and the heat sink 2 are assembled and connected and fixed by means of a buckle 12;

[0060] S8. The sealed thermal conductive filler 21 is cured naturally or baked to bond the plastic base 1 and the heat sink 2 into a whole.

[0061] The speed regulating module of the present invention is composed of a plastic base 1, a heat sink 2, a heating device 3, a circuit board assembly 4 (containing electronic components required for product functions), a connecting terminal 5 for signal transmission and reception, a retaining spring 6 and other components.

[0062] The assembly portion of the plastic base 1 and the radiator 2 is provided with a circle of grooves (glue filling grooves 13). Before being assembled with the radiator 2, the grooves are first filled with a sealing thermal conductive filler 21. A plurality of clips 12 are provided in the plastic base 1, and the radiator 2 is provided with grooves 22 that cooperate with the clips 12. After being assembled with the radiator 2, the clips 12 are connected and fixed, and the sealing thermal conductive filler 21 will fill the gap between the plastic base 1 and the radiator 2, and then the two are bonded into a whole by natural curing or baking curing.

[0063] The sealing thermal conductive filler 21 is generally cured naturally or baked, has high-strength bonding to plastic parts, aluminum alloys, electronic components, etc., has high hardness after curing, and the adhesive layer after bonding has strong impact resistance and high peeling strength, bonding the plastic base 1 and the heat sink 2 into an almost non-peelable whole, achieving a high sealing effect. It is completely different from the principle of sealing gaskets that rely on compression and rebound to seal, and is also different from conventional sealants that only fill the assembly gap but do not have good hardness and bonding strength, and can be peeled off.

[0064] The plastic base 1 comprises a connector interface 11, which can be selected into waterproof and non-waterproof types according to actual use requirements.

[0065] While filling the plastic base 1 with the sealing thermal conductive filler 21, a certain amount of the sealing thermal conductive filler 21 is also applied to the portion of the radiator 2 where the heating device 3 is assembled. In this way, when the plastic base 1 and the radiator 2 are assembled, the retaining spring 6 assembled on the back of the heating device 3 pushes against the plastic base 1 and the elastic force of the deformation causes the heating device 3 to be pressed tightly against the surface of the radiator 2, thereby completing the assembly of the heating device 3.

[0066] Before completing the assembly of the plastic base 1 and the heat sink 2, the spring clip 6 and the circuit board assembly 4 need to be installed first. The specific scheme is as follows: the spring clip 6 is placed on the heating device 3, and then the circuit board assembly 4 is placed on the spring clip 6 according to the positioning structure of the spring clip 6 to weld the pins of the heating device 3 to the circuit board. The base plate of the circuit board assembly 4 is provided with an anti-mistake groove 41 to ensure the uniqueness of the assembly direction.

[0067] Before completing the above welding, the connection terminal 5 needs to be welded to the circuit board. The connection terminal 5 is made into a pin header by injection molding. The pin header is provided with a positioning column 51 that cooperates with the positioning hole on the circuit board to fix the position of the connection terminal.

[0068] The material selected for the retaining spring 6 must have excellent elasticity. It is generally recommended to use QSn6.5-0.1, 65Mn, SUS301 stainless steel, etc. Steps are set at both ends of the retaining spring 6 for fixing the circuit board, and the walls extending on both sides are used to fix the circuit board. After being assembled with the plastic base 1, the walls extending on both sides are pressed and deformed. The rebound force of the retaining spring 6 acts on the heating device 3, so that the heating device 3 and the radiator 2 fit tightly.

[0069] The speed control module of the present invention is composed of a plastic base 1, a heat sink 2, a heating device 3, a circuit board assembly 4, a connecting terminal 5, a spring clip 6 and other components. The connecting terminal 5 is a pin header formed by injection molding a plurality of connecting terminals. There are two positioning columns 51 on the pin header for positioning the connecting terminal. The pin header is assembled with the circuit board assembly 4 and then welded. The spring clip 6 is assembled onto the heating device 3, and then the circuit board assembly 4 with the welded pin header is assembled according to the positioning structure of the spring clip 6, and then the heating device 3 and the temperature fuse 7 are welded. Finally, the circuit board assembly 4 is installed into the plastic base 1, and the heat sink 2 is pressed into the card slot of the plastic base 1. The buckle 12 of the plastic base 1 is inserted into the groove 22 of the heat sink 2 to lock the heat sink 2. At the same time, the spring clip 6 pushes against the bottom of the plastic base 1 to produce deformation. The rebound force of the spring clip 6 presses the heating device 3 to be close to the surface of the heat sink 2 so that the two are in good contact. At this point, the product is completed. Before the final assembly step, the glue filling groove 13 of the plastic base 1 needs to be filled with a sealing thermal conductive filler 21, and a certain amount of sealing thermal conductive filler 21 needs to be applied to the assembly surfaces of the heat sink 2 and the heating element 3. In this way, after the product is assembled and cured, the plastic base 1 and the heat sink 2 can be completely bonded together to form an inseparable whole, thereby achieving a sealing effect. The heating element 3 and the heat sink 2 are also bonded together to prevent the abnormality of poor contact.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An automobile speed control module, characterized in that: The invention comprises a plastic base and a heat sink, wherein a circuit board assembly, a connecting terminal, a heating device and a retaining spring are arranged in a sealed space enclosed by the plastic base and the heat sink, a connector interface is provided on the plastic base, one end of the connecting terminal extends into the connector interface, and the other end of the connecting terminal is welded to the circuit board assembly, the heating device is mounted on the circuit board assembly through the retaining spring, the pins of the heating device are welded to the circuit board assembly, the retaining spring is located between the heating device and the circuit board assembly, the two ends of the retaining spring abut against the inner wall of the plastic base, the heating device is bonded to the heat sink under the pressure of the retaining spring, and the plastic base and the heat sink are sealed and connected by an adhesive; the retaining spring comprises four first protruding walls located in the middle to and two second protruding walls at the end, the retaining spring is positioned and connected to the circuit board assembly through the first protruding wall and the second protruding wall, an opening is provided in the middle of the substrate of the circuit board assembly to engage with the first protruding wall, an opening groove is provided at the edge of the substrate of the circuit board assembly to engage with the second protruding wall, the second protruding wall extends from the heat sink toward the plastic base, and the second protruding wall abuts against the inner wall of the plastic base; an annular glue filling groove is provided on the inner wall of the plastic base, the glue filling groove is directly opposite to the top edge of the heat sink, the glue filling groove is filled with a sealing thermal conductive filler, and the plastic base is sealed and connected to the heat sink through the sealing thermal conductive filler; the assembly surfaces of the heat sink and the heating device are coated with a sealing thermal conductive filler.

2. The automobile speed control module according to claim 1, characterized in that: A circuit board assembly receiving groove is arranged in the plastic base, a plurality of buckles for clamping the heat sink are arranged in the plastic base, and a groove for clamping with the buckles is arranged on the top of the heat sink.

3. The automobile speed control module according to claim 1, characterized in that: An anti-error groove is arranged at the edge of the substrate of the circuit board assembly, and an anti-error rib which is clamped in the anti-error groove is arranged in the plastic base.

4. The automobile speed regulating module according to claim 1, characterized in that: The connection terminal is provided with two positioning posts, and the substrate of the circuit board assembly is provided with positioning holes corresponding to the positioning posts; the connection terminal is formed by injection molding of a plurality of inserts, and the inserts are provided with hollow circular holes to prevent the inserts from falling out after injection molding.

5. A method for manufacturing an automobile speed regulating module according to any one of claims 1 to 4, characterized in that: The steps include: S1. A circle of glue filling grooves is provided at the assembly position of the plastic base and the radiator, a plurality of buckles are provided in the plastic base, and a groove matching with the buckles is provided on the radiator; S2, soldering the connection terminals to the circuit board assembly; S3, assembling the clip onto the heating device, assembling the circuit board assembly with the welding connection terminal according to the positioning structure of the clip, and then welding the heating device and the temperature fuse; S4. Fill the glue slot with sealing thermal conductive filler before assembling with the radiator. Also, apply sealing thermal conductive filler to the part of the radiator where the heating device is assembled. S5, placing the circuit board assembly equipped with the connection terminals and the heating device into the plastic base; S6. When the plastic base and the heat sink are assembled, the spring mounted on the back of the heating element pushes against the plastic base and the elastic force of the deformation causes the heating element to be pressed tightly against the surface of the heat sink, thus completing the assembly of the heating element. S7, the plastic base and the heat sink are assembled and fixed by snap connection; S8. The sealed thermal conductive filler is naturally cured or baked to bond the plastic base and the heat sink into a whole.

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